Why do direct spark ignition furnaces and hot surface ignition furnaces require redundant gas valves?
A) in case one fails to open, the other will B) so that the unit will not overheat
C) because they require more fuel D) for safety since there is no pilot safety solenoid
D
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During the heating season, the vapor pressure of the inside air in a typical dwelling in the northern United States is
A) lower than the outside air. B) the same as the outside air. C) greater than the outside air.
Three basic types of switches are used in general wiring, the single-pole, the ____, and the four-way.
a. two-way b. three-way c. double-pole d. neutral
Explain the rationale for investigating accidents
What will be an ideal response?
The _____ style of construction comes from the Southwest, where it has been the dominant style since the mid-1930s.
A. Craftsman B. Prairie C. Ranch D. Farmhouse